Share-Based Compensation Plans (Schedule Of Changes In Stock Options) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-Based Compensation Plans [Abstract]
Option shares outstanding at beginning of period, Number of shares	1,601,200	2,204,600
Options granted, Number of shares		318,900
Option shares exercised, Number of shares	(173,900)	(640,800)
Options forfeited, Number of shares	(17,000)	(228,800)
Options expired, Number of shares		(52,700)
Option shares outstanding at end of period, Number of shares	1,410,300	1,601,200
Option shares exercisable at end of period, Number of shares	1,144,500	1,015,300
Option shares vested and expected to vest, Number of shares	1,393,900	1,579,600
Option shares outstanding at beginning of period, Weighted-average exercise price	$ 40.33	$ 35.60
Options granted, Weighted-average exercise price		53.93
Option shares exercised, Weighted-average exercise price	(36.45)	(27.80)
Options forfeited, Weighted-average exercise price	(53.08)	(48.03)
Options expired, Weighted-average exercise price		(43.49)
Option shares outstanding at end of period, Weighted-average exercise price	40.66	40.33
Option shares exercisable at end of period, Weighted-average exercise price	37.75	34.12
Option shares vested and expected to vest, Weighted-average exercise price	$ 40.52	$ 40.17
Option shares outstanding at end of period, Weighted-average remaining contractual term	6 years 1 month 6 days	6 years 10 months 24 days
Option shares exercisable at end of period, Weighted-average remaining contractual term	5 years 8 months 12 days	6 years
Option shares vested and expected to vest, Weighted-average remaining contractual term	6 years 1 month 6 days	6 years 10 months 24 days
Option shares exercised, Aggregate intrinsic value	$ 3.5	$ 17.1
Option shares outstanding at end of period, Aggregate intrinsic value	10.9	18.2
Option shares exercisable at end of period, Aggregate intrinsic value	10.9	17.3
Option shares vested and expected to vest, Aggregate intrinsic value	$ 10.9	$ 18.2